WASHINGTON -- The Justice Department's internal watchdog is faulting the agency for misguided strategies, errors in judgment and management failures during a bungled gun-trafficking probe in Arizona that resulted in hundreds of weapons turning up at crime scenes in the U.S. and Mexico.

In a 471-page report, Inspector General Michael Horowitz referred over a dozen people for possible disciplinary action for their roles in Operation Fast and Furious. The report did not criticize Attorney General Eric Holder.

The report found no evidence that Holder was informed about the operation before Jan. 31, 2011, or that the attorney general was told about the controversial gun-walking tactic employed by the department's Bureau of Alcohol, Tobacco, Firearms and Explosives.